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1967 Kennedy Half weighing 11.21 grams?

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  • 1967 Kennedy Half weighing 11.21 grams?

    Why does this 1967 Kennedy Half weigh 11.21 grams instead of the 11.5 grams it should weigh? Here are two pics: one with the 1967 and one with a 1968 on a scale. If more pics are needed I can post them. Thanks.
    Attached Files

  • #2
    Did you check the diameter and the thickness of the coin? If the thickness is less than normal, it maybe a rolled thin planchet. This would account for the weight difference.

    BJ Neff
    Member of: ANA, CCC, CONECA, Fly-in-club, FUN, NLG & T.E.V.E.C.

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    • #3
      You're right again! It looks to be thin! Thanks.
      Attached Files
      Last edited by amnight; 12-10-2012, 11:30 AM.

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      • #4
        Glad that I could be of help. It is handy to have a caliper on hand. Though it is hardly used, at times it does fill its need.

        BJ Neff
        Member of: ANA, CCC, CONECA, Fly-in-club, FUN, NLG & T.E.V.E.C.

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        • #5
          It's important to understand that the edge thickness of a coin is an unreliable indicator of how thick the original blank was. The edge expands as it collides with the working face of the collar. A very well-struck rolled-thin planchet can have an edge that is thicker than a weakly struck, full-thickness planchet.
          Mike Diamond. Error coin writer and researcher.

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          • #6
            @diamond: Can you tell me if this is an error due to the planchet(being thin) and coin weighing light? 11.21 grams vs. (weight shown in book) 11.5 grams. Do you consider this a large difference or is this normal?

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            • #7
              It's below tolerances but not egregiously so. It is an error, but one that has very little value.
              Mike Diamond. Error coin writer and researcher.

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